Hardness
Very Hard
405 PPM · 23.7 GPG
Local water dashboard
Official source aggregationWater quality in Evansville, WI 53536
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Rock County.
No active health-based violation reported
- Primary matched system
- Evansville Waterworks
- Source water
- Groundwater
- County
- Rock County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0.0036 mg/L
24% of action level
Utility match
5 systems
Serves 5,703 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
405 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
405
mg/L as CaCO₃ equivalent
Grains per gallon
23.7
1 GPG ≈ 17.1 PPM
What this means at home
At 405 PPM, mineral scale can build up on fixtures and heating elements, reduce soap lather, and leave visible spotting. Hardness is primarily an aesthetic and appliance concern—not itself a tap-water safety rating.
USGS sites used
73
Nearest site
31.6 mi
Observation range
Aug 3, 2016–Aug 8, 2024
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 27N10E-29.1d1 (Well).USGS source documentation ↗
Regional context
Is 53536 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Evansville median
405 PPM
About the same1 indexed ZIP readings · Range 405–405 PPM
Wisconsin median
288 PPM
117 PPM higher556 indexed ZIP readings · Range 41.3–467 PPM
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass
Lead (PB90)
0.0036 mg/L
Reported Sep 30, 2024
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0036
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 18
- Health-based
- 2
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | WI1540121 | Resolved | Jan 1, 2026through Jan 31, 2026 |
| Revised Total Coliform Rule | WI1541112 | Resolved | Jan 1, 2026through Jan 31, 2026 |
| Combined Radium (-226 and -228) | WI1540047 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Gross Alpha, Excl. Radon and U | WI1540047 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Radium-228 | WI1540047 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Lead and Copper Rule | WI1540124 | Resolved | Jan 1, 2025through Feb 19, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | WI1540124 | Resolved | Oct 17, 2024through Jun 5, 2025 |
| Public Notice | WI1540124 | Unaddressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONS | WI1540124 | Resolved | Oct 17, 2024through Jun 5, 2025 |
| Public Notice | WI1540124 | Unaddressed | Oct 17, 2024 |
| Consumer Confidence Rule | WI1540047 | Resolved | Jul 1, 2024through Aug 8, 2024 |
| Consumer Confidence Rule | WI1540047 | Resolved | Jul 1, 2024through Aug 8, 2024 |
| Revised Total Coliform RuleHealth-based | WI1540124 | Resolved | Nov 1, 2023through Nov 30, 2023 |
| Consumer Confidence Rule | WI1540047 | Resolved | Jul 1, 2022through Aug 2, 2022 |
| Lead and Copper Rule | WI1540770 | Resolved | Jan 1, 2022through Mar 1, 2022 |
| Public Notice | WI1540770 | Unaddressed | Oct 1, 2012 |
| Public Notice | WI1540770 | Unaddressed | Oct 1, 2012 |
| Public Notice | WI1540770 | Unaddressed | Oct 1, 2012 |
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Evansville ZIP 53536 using 405 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
405 PPM is 3× the high-hardness trigger used by this matcher.
Designed to reduce scale on fixtures, water heaters, glassware, and plumbing throughout the home.
Compare whole-house systemsAffiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Frequently asked
Water questions for Evansville
Is tap water safe in Evansville?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Nearby USGS observations produce an estimate of 405 PPM, or 23.7 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 405 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.